<template>
  <div>
    <span v-for="(item,index) in arr" :key="index">
      <input type="checkbox" v-model="arr2" :value="item">{{item}}
    </span>
    <div>你选中的元素，累加的值和为：{{sum}}</div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      arr2: []
    }
  },
  computed: {
    sum () {
      return this.arr2.reduce((sum, item) => (sum += item), 0)
    }
  },
  created () {

  },

  methods: {

  }
}
</script>

<style scoped lang='less'>

</style>
